NEC NMV 1700V Service Manual page 14

Continue
Check the 3.3 V power are supplied on I323, I330 pin 2.
Is a dot clock being outputted under the
condition that a LCD module is
connected to L322 pin 2?
Check the H-sync pulse of negative polarity
is output on RN314 pin 8 at TTL level.
Check the V-sync of negative polarity
are output on RN314 pin 7.
Next Page
Trouble Shooting
Check if the voltage on I323, I330
NG
pin 3 that is high level DC at 5V.
OK
OK
Failure point
I323, I330 Failure
NG
OK
NG
OK
NG
OK
Failure point
NG
1) Printed wire broke between I322 and I323, I330
2) I322 failure.
Failure point
1) I315 failure
2) Printed wire broke between I315 and L322 pin 2.
Failure point
1) I315 failure
2) Printed wire broke between I315 and RN314 pin 8.
Failure point
1) I315 failure
2) Printed wire broke between I315 and RN314 pin 7.
NMV 1700V
Page 3